AVRTargetTransformInfo.cpp

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//===-- AVRTargetTransformInfo.cpp - AVR specific TTI ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "AVRTargetTransformInfo.h"
 
using namespace llvm;
 
bool AVRTTIImpl::isLSRCostLess(const TargetTransformInfo::LSRCost &C1,
                               const TargetTransformInfo::LSRCost &C2) const {
  // AVR specific here are "instruction number 1st priority".
  // If we need to emit adds inside the loop to add up base registers, then
  // we need at least one extra temporary register.
  unsigned C1NumRegs = C1.NumRegs + (C1.NumBaseAdds != 0);
  unsigned C2NumRegs = C2.NumRegs + (C2.NumBaseAdds != 0);
  return std::tie(C1.Insns, C1NumRegs, C1.AddRecCost, C1.NumIVMuls,
                  C1.NumBaseAdds, C1.ScaleCost, C1.ImmCost, C1.SetupCost) <
         std::tie(C2.Insns, C2NumRegs, C2.AddRecCost, C2.NumIVMuls,
                  C2.NumBaseAdds, C2.ScaleCost, C2.ImmCost, C2.SetupCost);
}